Authlib (v1.7.2 and below) contains a signature verification bypass vulnerability.

Authlib

Authlib (v1.7.2 and below) contains a signature verification bypass vulnerability. The JsonWebSignature.deserialize_json() method accepts a JSON Serialization JWS object and returns the payload as successfully verified without checking for a signature and without requiring a cryptographic key.

Do this now

Upgrade authlib to 1.9.0.

Fix it

Authlib

Fix not named in the CVE record: see vendor advisory

authlib pip

pip install --upgrade "authlib>=1.9.0"

Fixed for Python (authlib); still cooking for Authlib.

First seen: 27 Oct 2026
Last update: 27 Oct 2026, 16:17 UTC
Fixed in: authlib 1.9.0
Identifiers: CVE-2026-96760
CVSS: 9.8
Source: news
On the menu as: PyPI packages

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Authlib (v1.7.2 and below) contains a signature verification bypass vulnerability.
Severity: critical. Patch status: partial fix.
Affected: Authlib
Fixed in: authlib 1.9.0
Ids: CVE-2026-96760

Authlib (v1.7.2 and below) contains a signature verification bypass vulnerability. The JsonWebSignature.deserialize_json() method accepts a JSON Serialization JWS object and returns the payload as successfully verified without checking for a signature and without requiring a cryptographic key.

## Steps
1. Search every lockfile and manifest (package-lock.json, yarn.lock, pnpm-lock.yaml, requirements*.txt, poetry.lock, uv.lock, composer.lock, go.sum, Cargo.lock, Gemfile.lock) for `authlib`. For each hit, compare the installed version with the fix on the same major line: authlib 1.9.0. If it's lower, give the exact upgrade command for the package manager this repo uses.
2. Fix by release line: authlib: <= 1.8.0 → 1.9.0. Authlib 1.7.x: the CVE record names no fix; check the vendor advisory before assuming there is none. Until one ships: restrict network access to it.

## Fix by release line
| Line | State | Fix | Until then |
|---|---|---|---|
| authlib <= 1.8.0 | fixed | 1.9.0 | — |
| Authlib 1.7.x | not named in the CVE record | check the vendor advisory | restrict network access to it |

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-96760") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://github.com/authlib/authlib https://nvd.nist.gov/vuln/detail/CVE-2026-96760 https://github.com/advisories/GHSA-6v38-4h7w-rj9h https://github.com/authlib/authlib/commit/6c11a02da8730914cea08ec195f1108a40dc6733 https://github.com/authlib/authlib/pull/938 https://github.com/authlib/authlib/security/advisories/GHSA-6v38-4h7w-rj9h
https://pwned.coffee/i/authlib-v1-7-2-and-below-contains-a-signature-verificati-cve-2026-96760

Timeline

27 Oct 2026, 16:17 UTC
GitHub published advisory GHSA-6v38-4h7w-rj9h (fixed: authlib 1.9.0).
27 Oct 2026, 15:18 UTC
Fix status: unknown → partial fix.
27 Oct 2026
First reported.

Receipt

Exploitation: No known exploitation
Fix by release line: Product Affected Fixed in Source
authlib (pip) <= 1.8.0 1.9.0 GitHub advisory checked 27 Oct
Authlib = 1.7.2 fix not named in the CVE record: see vendor advisory CVE record (CNA) checked 27 Oct
Score: CVSS 9.8 (critical). CVSS 3.1 9.8 (CISA ADP) for CVE-2026-96760
Last checked: 27 Oct 2026, 16:17 UTC

Product	Affected	Fixed in	Source
authlib (pip)	<= 1.8.0	1.9.0	GitHub advisory checked 27 Oct
Authlib	= 1.7.2	fix not named in the CVE record: see vendor advisory	CVE record (CNA) checked 27 Oct

Sources: KEV – CVE record ✓ Vendor ✓

Sources

Wrong fix version, or a source we missed? Send it back to chef@pwned.coffee with the source, and we'll correct it here.

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